Type-writing machine.



A. G. FL KUROWSKI. 'IYPE WRITING MACHINE. APPLxoATIoN FILED MAR. 5. 1910.

Patented Mar. 26, 1912.

UNTTED sTATEs' PATENT OFFICE. N

ALFRED Gf. F. KUROWSKI, OF NEW YORK, N. COMPANY, OF NEW YORK, N. Y.,

Y., ASSIGNOR T0 UNDERWOOD TYPEWRITER A CORPORATION OF NEW -J ERSEY.

TYPE-WRITING MACHINE.

Application filed March To all whom it may concern Be it known that l, ALFRED Gr. F. KUnowsur. a citizen of the UnitedStates, residing in New York city, borough of Brooklyn, in the county ot' Kings and State of New York, have invented certain new and useful Improvementsin Type-VVriting Machines, of which the following is a specification. y

This invention relates to means for adjusting the tension of the returning springs for the keys or key levers of typewriting machines.

Separate tension-regulating screws are usually provided, whereby to compress the springs individually more or less until a uniform pressure on all the key levers 4is obtained.

The main object of this invention is to enable the degree vof tension of all the key levers to be simultaneously adjusted and to enable the tension on the key levers at one 'si de of the machine to be simultaneously regulated relative to the tension of the key levers on the opposite side of the machine if necessary, while preserving ,the individual adjustment of the springs. To these ends, I niount the several {ey lever tensionsprings upon a tension bar bodil movable relative to the usual key lever ridge, on which the rear' ends of the key levers are fulcrumed. Said bar also carries the tension regulating screws for controlling the spring pressure on the individual key levers.

In the accompanying drawings, Figure 1 is a perspective view of a fragment of the frame of an Underwood typewriting machine` artly broken away and showing one embodiment of my invention applied thereto. Fig. 2 is a side View, partly in section, showing one manner of connecting the adjustable tension bar to the frame. Fig. 3 is a similar view taken from the'opposite side.

' Fig. llis a side view, like Fig. 2, showing the key levertension increased.

A transversely-extending key lever bridge 1 is supported on the base i). of a typewriting .machine of the Underwood style, directly in front of and parallel with the rear cross bar 3 of said base. Said bridge is slotted, as at 4l, and fitted into the slots are the rear ends of key levers 5 hooked, as atti, te engage a' fulcrum rod 7 carrie/d by the key lever bridge A locking plate S removably secured to the bridge prevents the disengagement of the vkey levers and fulcrum rod.

Specification of Letters Patent.

Patented Mair. 26, 1912.

5, 1910. Serial No. 547,405.

, Said key` levers extend forwardly beneath la second bridge 9 extending across the base-0f the machine, in which bridge are fulcrumed the elbow-shaped links 10 connected to the type-bars (notI shown) and having a slot and pin connection with the key levers 5, as indicated at 11 and 1Q, Fig. 4. It will be understood that the key levers are provided with keys (not shown) at their forward ends, in the usual manner.

Depression of the forward end f a key lever will swing the lever downwardly on its fulcrum 7 and rock the upper end of the link 10 forwardly to cause a type /banto strike the platen (not shown).

'lo return the key levers to normal position, a tension bar 13 is provided,.having seats lil formed therein for vthe several tension springs 15, whiclr engage the usual nibs on the lower edges of the key levers.

'Io o btain a uniform tension on all the key,

eov

are locked against accidental turning, by a,

)late 1T secured to the tension bar and havmg a lip 18. engaging the flattened sides 16 of the screws as is usual.

I' connect the tension bar 13 adjustably to the base by means` of headed 'supporting screws 19, one at each end of the bar, the adjustment of which screws simultaneously increases or decreases the spring tension against the key levers 5, without altering the adjustment of the individual tension screws 16. The screws 19 operate as hangers to ,sustain the tension bar beneath the series of key levers.

The tension bar may be guided, in its movement up and down b v dowels Q0 earried, b v the base and extending through arms 2l projecting from ,the tension bar. to prevent prevents the bnr from rocking and insures a perfect alinementof the springs, preventing any possibility of their dislodgment from then1hs. lt is also possible to regulate the tensionof-the key levers on one side only of the machine by manipulating one of the screwslt), without disturbing the tension of the 'key levers on the opposite side.

The pressure of the springs against the tension bar is transmitted to the sustaining screws or adjustalole supports 19 and prevents them tromA accidentally lloosening owing to the jar of the machine.

' bridge, and having nibs on the lower edges thereof, a transverse bar extending under said levers at said nibs, -coil springs seating at. their lower ends in said bar and at their upper ends on said nibs, adjusting screws passing loosely through said bar and mounted in said frame for adjusting rsaid bar up and down, said bar having laterally eXtending arms at the ends thereof, and guiding means Onsaid frame engaging said arms to prevent lateral movement ofsaid bar and preserve the alinement of said springs with 20 said nibs. v

ALFRED G. F. KUROWSKI.

Witnesses:

K. FRANKFORT, C. RIPLEY. 

